package com.hyl.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.hyl.common.to.es.SkuEsModel;
import com.hyl.common.utils.R;
import com.hyl.gulimall.search.config.GulimallElasticSearchConfig;
import com.hyl.gulimall.search.constant.EsConstant;
import com.hyl.gulimall.search.feign.ProductFeignService;
import com.hyl.gulimall.search.service.MallSearchService;
import com.hyl.gulimall.search.vo.AttrResponseVo;
import com.hyl.gulimall.search.vo.BrandVo;
import com.hyl.gulimall.search.vo.SearchParam;
import com.hyl.gulimall.search.vo.SearchResult;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    RestHighLevelClient client;

    @Autowired
    ProductFeignService productFeignService;


    @Override
    public com.hyl.gulimall.search.vo.SearchResult search(SearchParam param) {
        //1.动态构建出来查询需要的DSL语句
        com.hyl.gulimall.search.vo.SearchResult result = null;

        //1.装备检索请求
        SearchRequest searchRequest = buildSearchRequest(param);

        try {
            //2.执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);

            //3.分析响应数据封装成我们需要的格式
            result = buildSearchResult(response, param);

        } catch (IOException e) {
            e.printStackTrace();
        }


        return result;
    }

    /**
     * 构建结果数据
     *
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response, SearchParam param) {
        SearchResult result = new SearchResult();
        //1.返回的所有查询到的商品
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels = new ArrayList<>();
        if (hits.getHits() != null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())) {
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(string);
                }

                esModels.add(esModel);
            }
        }

        result.setProducts(esModels);

        //2.当前所有商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedLongTerms attrAgg = response.getAggregations().get("attr_agg");
        for (Terms.Bucket bucket : attrAgg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();

            //1.得到属性Id
            long attrId = bucket.getKeyAsNumber().longValue();

            //2.得到属性的Name
            ParsedStringTerms attrNameAgg = bucket.getAggregations().get("attr_name_agg");
            String attrName = attrNameAgg.getBuckets().get(0).getKeyAsString();
            //3.得到属性的value
            ParsedStringTerms attrImgAgg = bucket.getAggregations().get("attr_value_agg");
            List<String> attrValue = attrImgAgg.getBuckets().stream().map(item -> {
                String key = item.getKeyAsString();
                return key;
            }).collect(Collectors.toList());


            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValue);

            result.getAttrIds().add(attrId);

            attrVos.add(attrVo);
        }


        result.setAttrs(attrVos);
        //3.当前所有商品涉及到的所有品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brandAgg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brandAgg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();

            //1.得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();
            //2.得到品牌名
            ParsedStringTerms brandNameAgg = bucket.getAggregations().get("brand_name_agg");
            String brandName = brandNameAgg.getBuckets().get(0).getKeyAsString();
            //3.得到品牌的图片
            ParsedStringTerms brandImgAgg = bucket.getAggregations().get("brand_img_agg");
            String brandImg = brandImgAgg.getBuckets().get(0).getKeyAsString();

            brandVo.setBrandId(brandId);
            brandVo.setBrandName(brandName);
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }

        result.setBrands(brandVos);
        //4.当前所有商品涉及到的所有分类信息
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        ParsedLongTerms catalogAgg = response.getAggregations().get("catalog_agg");
        for (Terms.Bucket bucket : catalogAgg.getBuckets()) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到分类Id
            catalogVo.setCatalogId(Long.parseLong(bucket.getKeyAsString()));
            //得到分类名
            ParsedStringTerms catalogNameAgg = bucket.getAggregations().get("catalog_name_agg");
            String keyAsString = catalogNameAgg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(keyAsString);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);
        //=============以上从聚合信息中获取================
        //分页信息-页码
        result.setPageNum(param.getPageNum());
        //分页信息-总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);
        //分页信息-总页码-计算得到
        int totalPage = (int) (total % EsConstant.PRODUCT_PAGESIZE == 0 ? total / EsConstant.PRODUCT_PAGESIZE : (total / EsConstant.PRODUCT_PAGESIZE + 1));
        result.setTotalPages(totalPage);

        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPage; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        //6.构建面包屑导航功能
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {

            List<SearchResult.NavVo> navVos = param.getAttrs().stream().map(attr -> {
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                //1.分析每个attrs传过来的查询参数值
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                if (r.getCode() == 0) {
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {
                    });
                    navVo.setNavName(data.getAttrName());
                } else {
                    navVo.setNavName(s[0]);
                }

                //2.取消了这个面包屑以后，我们要跳转到那个地方,将请求地址的url里面的当前置空
                //拿到所有的查询条件，去掉当前。
                String replace = replaceQueryString(param, attr, "attrs");
                navVo.setLink("http://www.search.gulimall.com/list.html?" + replace);

                return navVo;
            }).collect(Collectors.toList());

            result.setNavs(navVos);
        }

        //品牌，分类
        if (param.getBrandId() != null && param.getBrandId().size() > 0) {
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();

            navVo.setNavName("品牌");
            //TODO 远程查询所有品牌

            R r = productFeignService.brandInfos(param.getBrandId());

            if (r.getCode() == 0) {
                List<BrandVo> brand = r.getData("brand", new TypeReference<List<BrandVo>>() {
                });
                StringBuffer buffer = new StringBuffer();
                String replace = "";
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getBrandName() + ";");
                    replace = replaceQueryString(param, brandVo.getBrandId() + "", "brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://www.search.gulimall.com/list.html?"+replace);
            }
            navs.add(navVo);
        }

        //TODO 分类：不需要导航取消


        return result;
    }


    private String replaceQueryString(SearchParam param, String value, String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            encode = encode.replace("+", "%20");//浏览器对空格编码和java不一样
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return param.get_queryString().replace("&" + key + "=" + encode, "");
    }


    /**
     * #模糊匹配，过滤（按照属性，分类，品牌价格区间，库存），排序，分页，高亮，聚合分析
     * 准备检索请求
     *
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam param) {

        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();//构建DSL语句的

        /**
         * 模糊匹配，过滤（按照属性，分类，品牌价格区间，库存）
         */

        //1.构件录入bool-query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1.must-模糊匹配
        if (!StringUtils.isEmpty(param.getKeyword())) {
            boolQuery.must(QueryBuilders.matchQuery("skuTitle", param.getKeyword()));

        }

        //1.2.bool-filter - 按照三级分类id查询
        if (param.getCatalog3Id() != null) {
            boolQuery.filter(QueryBuilders.termQuery("catalogId", param.getCatalog3Id()));
        }

        //1.3.bool-filter - 按照品牌id查询
        if (param.getBrandId() != null) {
            boolQuery.filter(QueryBuilders.termsQuery("brandId", param.getBrandId()));
        }

        //1.4.bool-filter - 按照所有指定的属性查询

        if (param.getAttrs() != null && param.getAttrs().size() > 0) {


            for (String attr : param.getAttrs()) {
                //attr =1_5寸:8寸
                String[] s = attr.split("_");
                String attrId = s[0];//检索的属性id
                String[] attrValues = s[1].split(":");//这个属性的检索用的值
                boolQuery.filter(QueryBuilders.termQuery("attrs.attrId", attrId));
                boolQuery.filter(QueryBuilders.termsQuery("attrs.attrValue", attrValues));

            }

        }


        //1.5.bool-filter - 按照库存是否有查询
        if (param.getHasStock() != null) {
            boolQuery.filter(QueryBuilders.termQuery("hasStock", param.getHasStock() == 1));

        }

        //1.6.bool-filter - 按照价格区间查询
        if (!StringUtils.isEmpty(param.getSkuPrice())) {
            RangeQueryBuilder skuPrice = QueryBuilders.rangeQuery("skuPrice");

            String[] s = param.getSkuPrice().split("_");
            //s会将空值会存储到s判断长度+1  s["","6000"]
            if (s.length == 3) {
                //区间
                skuPrice.gte(s[1]).lte(s[2]);
            } else if (s.length == 2) {
                if (param.getSkuPrice().startsWith("_")) {
                    skuPrice.lte(s[1]);
                }

                if (param.getSkuPrice().endsWith("_")) {
                    skuPrice.gte(s[1]);
                }
            }

            boolQuery.filter(skuPrice);
        }


        //把以前的所有条件都拿来进行封装
        sourceBuilder.query(boolQuery);

        /**
         * 排序，分页，高亮
         */
        //2.1排序
        if (!StringUtils.isEmpty(param.getSort())) {
            String sort = param.getSort();
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0], SortOrder.ASC);
        }
        //2.2分页 pageSize:5
        //pageNum:1 from:0 size:5 [0,1,2,3,4]
        //pageNum:2 from:5 size:5 [5,6,7,8,9]
        //from =(pageNum-1)*size
        sourceBuilder.from((param.getPageNum() - 1) * EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        //2.3高亮
        if (!StringUtils.isEmpty(param.getKeyword())) {
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }


        /**
         * 聚合分析
         */
        //1.品牌聚合
        TermsAggregationBuilder brandAgee = AggregationBuilders.terms("brand_agg");
        brandAgee.field("brandId").size(50);
        //品牌聚合的子聚合
        brandAgee.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName"));
        brandAgee.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg"));
        //TODO 1.聚合brand
        sourceBuilder.aggregation(brandAgee);

        //2.分类集合

        TermsAggregationBuilder catalogAgg = AggregationBuilders.terms("catalog_agg");
        catalogAgg.field("catalogId").size(20);
        //分类聚合的子聚合
        catalogAgg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        //TODO 2.聚合catalog
        sourceBuilder.aggregation(catalogAgg);

        //3.属性聚合
        TermsAggregationBuilder attrAgg = AggregationBuilders.terms("attr_agg");
        attrAgg.field("attrs.attrId").size(20);
        //分类聚合的子聚合
        attrAgg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        attrAgg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue"));
        //TODO 2.聚合attr
        sourceBuilder.aggregation(attrAgg);


        String s = sourceBuilder.toString();
        System.out.println("构建的DSL" + s);

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);

        return searchRequest;
    }
}
